SalesPad, while respecting default Purchasing UofM in GP, does not have a way to set that or adjust options. Please add the fields from the GP Item Purchasing Options to the SalesPad Item Maintenance window.
Official response
Cavallo IT
This feature is now available in SalesPad 5.5.2!
Check out the full release notes here: https://support.cavallo.com/article/1997-salespad-desktop-release-notes#:~:text=Desktop Release Notes-,Version 5.5.2,-Release Date 10
Thank you for this idea! We have created an internal case for review.